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http://ko.com.ua/protokol_mqtt_i_nemnogo_iz_opyta_realizacii_chast_1_110176

Подключаем в VisualStudio:

https://visualgdb.com/tutorials/esp8266/mqtt/

SUTABLE (for Chrome!) MQTT plugin - works well:

https://chrome.google.com/webstore/detail/mqttlens/hemojaaeigabkbcookmlgmdigohjobjm?hl=ru

 MQTT arduino via GSM 

https://elementztechblog.wordpress.com/2016/07/18/arduino-mqtt-library-for-sim800-gsm-modem/comment-page-1/

LWMQTT via ARDUINO and else (C based):

https://github.com/256dpi/arduino-mqtt/tree/master/src/lwmqtt

Understandable: how to pack messages for MQTT:

https://blog.benjamin-cabe.com/2014/08/26/mqtt-on-the-ti-cc3200-launchpad-thanks-to-paho-embedded-client

MBED:

https://developer.mbed.org/teams/ublox/code/Cellular_HelloMQTT/

 

 

This is simple Quectel M95 TCP socket connection command, AT+QIOPEN

int  CONNECT_SERVER_SOC (char *ip,int soc ){

    char bf[128];
    sprintf(bf,"AT+QIOPEN=\"TCP\",\"%s\",%d\r\n",ip,soc); // ip= "198.41.30.241", port:1883
                                                          // iot.eclipse.org
    printf("%s",bf);
}